P3-Partical Model Of Matter KW Flashcards
Change in Thermal Energy
The product of the mass, specific heat capacity and temperature change of a substance.
Chemical Changes
Changes to the chemical structure of a substance. The substance does not usually restore its original properties when the changes are reversed.
Condensation
The changing from vapour state to a liquid state, when a substance is cooled.
Density
The mass per unit volume of an object
Evaporation
The changing from liquid state to a vapour state, when a substance is heated
Freezing
The changing from a liquid state to a solid state, when a substance is cooled
Gas Temperature
The temperature of a gas is directly proportional to the average kinetic energy of its molecules.
Internal Energy
The energy stored by the atoms and molecules that make up a system. It is equal to the sum of the total kinetic and potential energies of the particles in the system.
Latent Heat
The energy required for a substance to change state
Melting
The changing from solid state to liquid state, when a substance is heated.
Pascals
The unit of pressure
Physical Changes
Changes to the physical properties of a substance which can be reversed. Changes of state are physical changes since substances can restore their original properties when the changes are reversed.
Pressure
The force acting perpendicular to a surface, per unit area
Specific Latent Heat of Fusion
The amount of energy needed to change the state of one kilogram of a substance from solid state to liquid state, whilst held at constant temperature.
Specific Latent Heat of Vaporisation
The amount of energy needed to change the state
of one kilogram of a substance from liquid state to vapour state, whilst held at constant temperature.
